Ok, thanks for the inputs. The problem continues, though. I'm using the current cwrsync version now (which includes rsync 3.0.5). The detailed output shows that the receiving of the file names works perfectly, but when the generator starts things are getting very slow. It somhow takes unacceptabely long for these tasks:
[generator] make_file(x/y.pdf,*,2)
The files in question are sometimes quite large (200-300MB). I also tried to use the parameter "--size-only" but that did not help either.

However: If I cancel the job and run it a second time, these "make_file"-tasks are executed in a normal fast way for the files that have already been checked until it reaches the files that were not covered during the first (incomplete) run. And: When I attach the drive to a darwin pc and sync it there, then go back to the windows machine and do a sync again, the slow checks begin anew.

Can you give more hints based on these infos?

Andreas

Am 09.01.2009 um 02:40 schrieb Matt McCutchen:

On Thu, 2009-01-08 at 11:38 +0100, Andreas Nef wrote:
I have a dozen of external usb disks which should be kept in sync with
a central rsync server.
As I can't predict which OS they will be used with they are formatted
with fat32. If I use them with either Linux (ubuntu) or OS X rsync
works without problems. However, when I try the syncing with the hd
attached to a windows pc the rsync process (using cygwin) will take
close to 40 minutes only check what needs to be updated. Does anybody
know what could be the cause for this strange behaviour? Is it
something with permissions (parameters I used for initial creation of
the copy were "-rtluvz --modify-window=1")? Or are there compatibility
issues with rsync/cygwin?

Cygwin might just be slow, or there might genuinely be something strange going on. Increase the verbosity to -vvv to find out more about what is taking so long. Also, you may wish to use rsync >= 3.0.0 on the Windows machine to get the speed benefit of incremental recursion, if you aren't
already doing so.

--
Matt


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